whoa, no, no, no to the whole thing of your parents not being able to watch them all day. for a very, very long time...perhaps forever, SOMEONE will have to watch and supervise these two. leaving two bitches alone who "get aggressive and growl" is an accident waiting to happen. please revise your expectations of these two girls. they don't call it "bitch fighting" for no reason. you may never be able to be comfortable with them together, surely at the least you'll have to go very slow and be very certain that they won't harm each other, before they can be left unsupervised, if ever. sorry to have to tell you that, but you don't want to see the results of two bitches in a knock-down/drag-out.